A heat dissipation structure for an integrated power assembly of an electric counterbalanced forklift truck

Abstract

This invention relates to the field of integrated powertrain technology and discloses a heat dissipation structure for an integrated powertrain of an electric counterbalance forklift, including a power component and a heat dissipation component. The heat dissipation component includes a housing, an inner frame, a movable frame that slides vertically inside the frame, an oil pipe assembly fixed in the middle inside the frame, two pressure plates that slide symmetrically inside the movable frame, several pairs of partitions on the side of the two pressure plates that are close to each other, and several sets of cleaning components on the side of each pair of partitions that are close to each other. This invention can use the round pipe and cooling water pipe to achieve dual heat dissipation for the inside and outside of the rotor, greatly reducing the temperature of the rotor; and hydraulic oil is transported to the oil pump through the round pipe, thereby using the cooled hydraulic oil to perform oil cooling heat dissipation for the impeller inside the oil pump, so as to facilitate the use of hydraulic oil to quickly carry away the heat of the oil pump motor and the oil pump, and extend the service life of the oil pump motor and the oil pump.

Description

Technical Field

[0001] This invention belongs to the field of integrated powertrain technology, and more specifically, relates to a heat dissipation structure for an integrated powertrain of an electric counterbalance forklift. Background Technology

[0002] In existing electric counterbalance forklift integrated powertrains, the oil pump motor is an improved version of the specific motor that drives the oil pump. Because the oil pump motor needs to operate for extended periods during actual use, it generates heat during high-speed operation. Currently, the cooling methods for the oil pump motor are primarily air cooling or natural cooling. Natural cooling is ineffective for the integrated powertrain of electric counterbalance forklifts, and prolonged use can easily damage the motor, resulting in a relatively short lifespan.

[0003] The existing heat dissipation structures for integrated powertrains still have the following drawbacks: The heat dissipation structure of the integrated powertrain of electric counterbalance forklifts is complex and inefficient. Each unit needs to be cooled or ventilated individually, and most of them rely on natural conduction or forced air cooling, resulting in a complex structure.

[0004] The power components in the integrated powertrain of an electric counterbalance forklift include a hydraulic pump motor and a hydraulic pump. The hydraulic pump motor is directly connected to the hydraulic pump via a drive shaft, driving the pump. The impeller inside the pump generates centrifugal force as it rotates, drawing hydraulic oil in from the inlet, pressurizing it, and then expelling it from the outlet. The hydraulic oil is then transported through oil pipes to the lifting cylinder or hydraulic motor, enabling actions such as lifting, tilting, or turning of the goods. The main heat-generating components are the hydraulic pump motor and the impeller within the pump, necessitating heat dissipation for both. However, current cooling systems cannot simultaneously cool both the pump motor and the impeller, thus affecting the overall cooling effect of the integrated powertrain and resulting in poor cooling of the pump itself, impacting the lifespan of both the motor and the pump.

[0005] In order to improve the heat dissipation of the integrated powertrain of electric counterbalance forklifts, the cooling structure usually uses coolant to exchange heat in the cooling pipes inside the motor housing. However, scale adheres to the inside of the cooling pipes inside the motor housing, and the thickness of the scale layer gradually increases. This not only affects the heat exchange efficiency between the coolant and the motor, but also blocks the cooling pipes, affecting the circulation of the coolant.

[0006] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a heat dissipation structure for the integrated powertrain of electric counterbalance forklifts, in order to achieve a more practical and valuable purpose. Summary of the Invention

[0007] This invention provides a heat dissipation structure for the integrated powertrain of an electric counterbalance forklift, which overcomes the above-mentioned defects in the prior art.

[0008] The purpose and effectiveness of the heat dissipation structure for the integrated powertrain of an electric counterbalance forklift, as described in this invention, are achieved through the following specific technical means: A heat dissipation structure for an integrated powertrain of an electric counterbalance forklift includes a power component and a heat dissipation component. The power component includes an oil pump motor and an oil pump. The oil pump motor has a spiral cooling water pipe inside. The heat dissipation component includes a housing, and the housing has a frame inside. A movable frame is vertically slidable inside the frame. An oil pipe assembly is fixed in the middle of the frame. The oil pipe assembly consists of several annular oil pipes and several connecting oil pipes. The several annular oil pipes in the oil pipe assembly are interconnected through the several connecting oil pipes. Two pressure plates are symmetrically slidably arranged inside the movable frame. Several pairs of partitions are arranged on the side of the two pressure plates that are close to each other. Several sets of cleaning components are arranged on the side of each pair of partitions that are close to each other. The frame has a first hydraulic chamber and a second hydraulic chamber separated by the movable frame. A box is provided on each side of the second hydraulic chamber. Two elastic elements are symmetrically arranged in the middle of the second hydraulic chamber. An elastic water bag is connected between each of the two boxes and the two elastic elements.

[0009] Preferably, the oil pump is installed on one side of the oil pump motor, and the housing is installed on the other side of the oil pump motor. The two pressure plates, on opposite sides, are respectively connected to the inner side walls of the frame by a first connecting plate. One end of the first connecting plate is rotatably connected to the pressure plate, and the other end of the first connecting plate is rotatably connected to the frame. The two pressure plates are separated by several pairs of partitions to form a first S-shaped channel. One end of the cooling water pipe is connected to the first hydraulic chamber, and the other end of the cooling water pipe is connected to the second hydraulic chamber.

[0010] Preferably, each set of cleaning components consists of several pairs of cleaning components, and several second S-shaped channels are formed between each pair of partitions through several sets of cleaning components. Several clearance grooves are provided at intervals on each partition. The annular oil pipe in the oil pipe assembly slides in the clearance grooves, and a rubber component is provided between the outer wall of the annular oil pipe in the oil pipe assembly and the clearance grooves.

[0011] Preferably, the elastic element has a V-shaped structure, one end of the elastic element is fixedly connected to one side wall of the second hydraulic chamber, the other end of the elastic element is fixedly connected to one outer wall of the movable frame, the middle part of the elastic element is provided with a plurality of first through holes communicating with the interior of the elastic water bladder, and the interior of the elastic water bladder is provided with a first one-way valve communicating with the interior of the box.

[0012] Preferably, the elastic water bladder has a rotating shaft inside, and a water wheel is fitted on the outer wall of each end of the rotating shaft. A plurality of stirring plates are arranged in a circular array on the outer wall of the middle part of the rotating shaft.

[0013] Preferably, a second check valve is provided inside the movable frame and communicates with the first hydraulic chamber, and a third check valve is provided inside the movable frame and communicates with the second hydraulic chamber. Two waterproof motors are symmetrically installed inside the first hydraulic chamber. A circular plate is provided at the output end of the waterproof motor. A second connecting plate is provided on one side of the circular plate and connected to the outer wall of the movable frame. One end of the second connecting plate is rotatably connected to the circular plate, and the other end of the second connecting plate is rotatably connected to the outer wall of the movable frame.

[0014] Preferably, the lower outer end of the frame is provided with a shell, the lower inner side of the shell is provided with an L-shaped partition, the upper side of the L-shaped partition is provided with a V-shaped partition, the interior of the shell is separated by the L-shaped partition and the V-shaped partition to provide a first cavity, a second cavity, and a liquid inlet cavity, the interior of the second hydraulic cavity is connected to the first cavity by a through port, the lower part of the V-shaped partition is provided with a plurality of second through holes, the first cavity is connected to the second cavity by a plurality of second through holes, the liquid inlet cavity is connected to an external coolant tank by a connection port, the liquid inlet cavity is connected to the first cavity by a fourth one-way valve, and the fourth one-way valve is installed at one end of the L-shaped partition.

[0015] Preferably, an inverted V-shaped filter plate is provided on the lower middle side of the second hydraulic chamber, the V-shaped filter plate covers the opening, a cooler is installed on the outer side of the frame, the second chamber is connected to the cooler by a first connecting pipe, and the cooler is connected to the first hydraulic chamber by a second connecting pipe.

[0016] Preferably, the oil pump motor includes a motor housing, a motor shaft is rotatably disposed inside the motor housing, a rotor is disposed on the outer wall of the motor shaft, a stator is disposed on the inner wall of the motor housing, a plurality of heat dissipation fins are disposed on the outer wall of the motor housing, and the cooling water pipe is located between the outer wall of the rotor and the inner wall of the stator.

[0017] Preferably, a circular tube is rotatably provided inside the motor shaft, an oil inlet is provided in the middle of one side of the housing, one end of the oil pipe assembly is connected to the oil inlet, the other end of the oil pipe assembly is fixedly connected to one end of the circular tube, and the other end of the circular tube is connected to the interior of the oil pump.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a heat dissipation structure for an integrated powertrain of an electric counterbalance forklift. Through the arrangement of a first hydraulic chamber, cooling water pipes, a second hydraulic chamber, and a cooler, coolant in the first hydraulic chamber is transported to the cooling water pipes, where it spirals and flows, thus providing water cooling for the internal components of the oil pump motor and reducing the temperature of the stator and rotor. Coolant in the cooling water pipes is then transported to the second hydraulic chamber, and from there to the cooler via a first connecting pipe. The cooler further cools the coolant, which is then transported back to the first hydraulic chamber via the second connecting pipe. This allows the coolant to circulate within the first hydraulic chamber, cooling water pipes, second hydraulic chamber, and cooler, continuously providing water cooling for the internal components of the oil pump motor. Furthermore, the arrangement of an oil pipe assembly, circular pipes, and a movable frame allows hydraulic oil to flow within the oil pipe assembly. The use of several annular oil pipes and connecting oil pipes in the assembly extends the contact time between the hydraulic oil and coolant, improving the heat exchange efficiency between them. The cooled hydraulic oil is delivered into the circular pipe, where it cools the interior of the rotor. The circular pipe, along with the cooling water pipe, provides dual cooling to both the inside and outside of the rotor, significantly reducing its temperature. The cooled hydraulic oil is then delivered to the oil pump, where it cools the impeller, allowing the pump motor and internal components to quickly dissipate heat and extend their lifespan.

[0019] This invention discloses a heat dissipation structure for an integrated powertrain of an electric counterbalance forklift. Through the arrangement of a movable frame, pressure plates, and partitions, a first S-shaped channel is formed between the two pressure plates inside the movable frame via several pairs of partitions, thereby extending the contact time between the coolant and the hydraulic oil in the oil pipe assembly and improving the heat exchange efficiency between the coolant and the hydraulic oil. Furthermore, through the arrangement of cleaning components, several sets of cleaning components are arranged between each pair of partitions, thus forming several second S-shaped channels between each pair of partitions, further extending the contact time between the coolant and the hydraulic oil in the oil pipe assembly. Moreover, the upward movement of the movable frame causes the two pressure plates to move upward. The upward movement of the two pressure plates is met by two first connecting plates, causing the two pressure plates to move closer together. This movement of the two pressure plates causes several pairs of partitions to move, and each pair of partitions moves several sets of cleaning components. These cleaning components clean the scale adhering to the outer wall of the annular oil pipe in the oil pipe assembly, thereby maintaining the heat exchange effect between the hydraulic oil in the oil pipe assembly and the coolant in the movable frame. Finally, during the up-and-down movement of the movable frame, the two first connecting plates allow the two pressure plates to alternately move closer and further apart, thereby enabling several pairs of partitions and several sets of cleaning components to move back and forth. This facilitates the continuous cleaning of scale from the outer wall of the annular oil pipe in the oil pipe assembly using the cleaning components. Furthermore, it allows for frequent flow of coolant between the two pressure plates within the movable frame, preventing localized overheating of the coolant and promoting efficient heat exchange between the coolant and the hydraulic oil within the oil pipe assembly.

[0020] This invention discloses a heat dissipation structure for an integrated powertrain of an electric counterbalance forklift. Through the arrangement of elastic elements and an elastic water bladder, a downward-moving movable frame compresses and deforms the two elastic elements, increasing the distance between the center of the elastic elements and the housing. The elastic water bladder then recovers its shape under the elastic force. A first one-way valve delivers a special descaling agent from the housing to the elastic water bladder, and several first through-holes absorb coolant from the second hydraulic chamber into the elastic water bladder, facilitating the dilution of the special descaling agent within the bladder. An upward-moving movable frame straightens the two elastic elements, reducing the distance between the center of the elastic elements and the housing, thereby compressing the elastic water bladder. The solution within the elastic water bladder is then expelled through the several first through-holes, allowing the diluted special descaling agent to be sprayed into the second hydraulic chamber, thus reducing scale buildup in the coolant within the second hydraulic chamber. Furthermore, through the arrangement of the rotating shaft, water wheel, and stirring plates, the coolant flows in the elastic water bladder and comes into contact with the two water wheels, thereby driving the rotating shaft to rotate. The rotation of the rotating shaft drives several stirring plates to rotate, and the rotation of the stirring plates stirs and mixes the solution in the elastic water bladder, which helps to promote the dilution of the special descaling agent. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the first isometric structure of the present invention; Figure 2 This is a schematic diagram of the second isometric structure of the present invention; Figure 3 This is a schematic diagram of the first isometric structure of the heat dissipation component in this invention; Figure 4 This is a schematic diagram of the second isometric structure of the heat dissipation component in this invention; Figure 5 This is a schematic diagram of the third isometric structure of the heat dissipation component in this invention; Figure 6 This is a top view of the structure of the present invention; Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure at point AA; Figure 8 This is a first front view schematic diagram of the heat dissipation component in this invention; Figure 9 This is a schematic diagram of the left-side structure of the heat dissipation component in this invention; Figure 10 for Figure 9 Schematic diagram of the cross-sectional structure at point BB; Figure 11 for Figure 10 A magnified schematic diagram of the local structure at point F; Figure 12 This is a top view of the heat dissipation component in this invention. Figure 13 for Figure 12 Schematic diagram of the cross-sectional structure at the CC section; Figure 14 This is a second front view schematic diagram of the heat dissipation component in this invention; Figure 15 for Figure 14 Schematic diagram of the cross-sectional structure at the middle DD section; Figure 16 for Figure 14 Schematic diagram of the cross-sectional structure at the EE section.

[0024] Explanation of reference numerals in the attached figures: Oil pump motor 10, 11, oil pump 12, oil inlet end 13, housing 14, frame 15, movable frame 16, first hydraulic chamber 17, second hydraulic chamber 18, cooler 19, housing 20, box 21, elastic element 22, elastic water bladder 23, first check valve 24, first through hole 25, rotating shaft 26, water wheel 27, stirring plate 28, second check valve 29, third check valve 30, pressure plate 31, first connecting plate 32, oil pipe assembly 33, partition 34, cleaning component 3 5. Circumvention groove 36. Rubber part 37. Waterproof motor 38. Circular plate 39. Second connecting plate 40. L-shaped partition 41. V-shaped partition 42. V-shaped filter plate 43. Through port 44. First cavity 45. Second cavity 46. Liquid inlet cavity 47. Second through hole 48. Connection port 49. Fourth one-way valve 50. First connecting pipe 51. Second connecting pipe 52. Motor housing 53. Motor shaft 54. Stator 55. Rotor 56. Heat dissipation fins 57. Circular tube 58. Cooling water pipe 59. Detailed Implementation

[0025] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0026] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] like Figures 1 to 16 As shown: This invention provides a heat dissipation structure for the integrated powertrain of an electric counterbalance forklift. like Figures 1 to 16As shown, it includes a power assembly and a heat dissipation assembly. The power assembly includes an oil pump motor 10 and an oil pump 12. The oil pump motor 10 has a spiral cooling water pipe 59 inside. The heat dissipation assembly includes a housing 14, and a frame 15 is provided inside the housing 14. A movable frame 16 is vertically slidably provided inside the frame 15. An oil pipe assembly 33 is fixedly provided in the middle of the inside of the frame 15. The oil pipe assembly 33 is composed of several annular oil pipes and several connecting oil pipes. The several annular oil pipes in the oil pipe assembly 33 are interconnected through the several connecting oil pipes in the oil pipe assembly 33. The movable frame 16 has two pressure plates 31 that slide symmetrically inside. Several pairs of partitions 34 are provided on the side of the two pressure plates 31 that are close to each other. Several sets of cleaning parts 35 are provided on the side of each pair of partitions 34 that are close to each other. The frame 15 is divided into a first hydraulic chamber 17 and a second hydraulic chamber 18 by the movable frame 16. A box 21 is provided on each side of the second hydraulic chamber 18. Two elastic elements 22 are symmetrically provided in the middle of the second hydraulic chamber 18. An elastic water bag 23 is connected between the two boxes 21 and the two elastic elements 22 respectively.

[0029] Preferred, such as Figures 1 to 7 As shown, the oil pump 12 is installed on one side of the oil pump motor 10, and the housing 14 is installed on the other side of the oil pump motor 10. The two pressure plates 31 are respectively connected to the inner two side walls of the frame 15 on opposite sides, and a first connecting plate 32 is provided. One end of the first connecting plate 32 is rotatably connected to the pressure plate 31, and the other end of the first connecting plate 32 is rotatably connected to the frame 15. The two pressure plates 31 are separated by several pairs of partitions 34 to form a first S-shaped channel. One end of the cooling water pipe 59 is connected to the first hydraulic chamber 17, and the other end of the cooling water pipe 59 is connected to the second hydraulic chamber 18.

[0030] Preferred, such as Figure 4 , Figure 5 , Figure 13 , Figure 16 As shown, each set of cleaning components 35 consists of several pairs of cleaning components 35. Several second S-shaped channels are formed between each pair of partitions 34 through several sets of cleaning components 35. Several clearance grooves 36 are provided on each partition 34 at intervals. The annular oil pipe in the oil pipe assembly 33 slides in the clearance groove 36. A rubber component 37 is provided between the outer wall of the annular oil pipe in the oil pipe assembly 33 and the clearance groove 36.

[0031] Preferred, such as Figure 3 , Figure 4 , Figure 11 As shown, the elastic element 22 has a V-shaped structure. One end of the elastic element 22 is fixedly connected to one side wall of the second hydraulic chamber 18, and the other end of the elastic element 22 is fixedly connected to one side wall of the movable frame 16. The middle part of the elastic element 22 is connected to the interior of the elastic water bladder 23 and is provided with several first through holes 25. The interior of the elastic water bladder 23 is connected to the interior of the box 21 and is provided with a first one-way valve 24.

[0032] Preferred, such as Figure 11 As shown, the elastic water bladder 23 has a rotating shaft 26 inside, and a water wheel 27 is respectively fitted on the outer wall of both ends of the rotating shaft 26. Several stirring plates 28 are arranged in a circular array on the outer wall of the middle part of the rotating shaft 26.

[0033] Preferred, such as Figure 3 , Figure 4 , Figure 10 As shown, the interior of the movable frame 16 is connected to the first hydraulic chamber 17 and is equipped with a second check valve 29. The interior of the movable frame 16 is connected to the second hydraulic chamber 18 and is equipped with a third check valve 30. Two waterproof motors 38 are symmetrically installed inside the first hydraulic chamber 17. The output end of the waterproof motor 38 is equipped with a circular plate 39. One side of the circular plate 39 is connected to the outer wall of the movable frame 16 and is equipped with a second connecting plate 40. One end of the second connecting plate 40 is rotatably connected to the circular plate 39, and the other end of the second connecting plate 40 is rotatably connected to the outer wall of the movable frame 16.

[0034] Preferred, such as Figure 10 As shown, a housing 20 is provided at the lower outer end of the frame 15. An L-shaped partition 41 is provided on the lower inner side of the housing 20. A V-shaped partition 42 is provided on the upper side of the L-shaped partition 41. The housing 20 is divided into a first cavity 45, a second cavity 46, and a liquid inlet cavity 47 by the L-shaped partition 41 and the V-shaped partition 42. The interior of the second hydraulic cavity 18 is connected to the first cavity 45 by a through port 44. The lower part of the V-shaped partition 42 is provided with several second through holes 48. The first cavity 45 is connected to the second cavity 46 by several second through holes 48. The liquid inlet cavity 47 is connected to an external coolant tank by a connection port 49. A fourth check valve 50 is provided between the liquid inlet cavity 47 and the first cavity 45. The fourth check valve 50 is installed at one end of the L-shaped partition 41.

[0035] Preferred, such as Figure 10 As shown, an inverted V-shaped filter plate 43 is provided on the lower middle side of the second hydraulic chamber 18. The V-shaped filter plate 43 covers the opening 44. A cooler 19 is installed on the outer side of the frame 15. The second chamber 46 is connected to the cooler 19 by a first connecting pipe 51. The cooler 19 is connected to the first hydraulic chamber 17 by a second connecting pipe 52.

[0036] Preferred, such as Figure 1 , Figure 2 , Figure 7 As shown, the oil pump motor 10 includes a motor housing 53, a motor shaft 54 ​​is rotatably mounted inside the motor housing 53, a rotor 56 is mounted on the outer wall of the motor shaft 54, a stator 55 is mounted on the inner wall of the motor housing 53, a plurality of heat dissipation fins 57 are mounted on the outer wall of the motor housing 53, and a cooling water pipe 59 is located between the outer wall of the rotor 56 and the inner wall of the stator 55.

[0037] Preferred, such as Figure 7 As shown, a circular tube 58 is rotatably installed inside the motor shaft 54, and an oil inlet 13 is provided in the middle of one side of the outer casing 14. One end of the oil pipe assembly 33 is connected to the oil inlet 13, and the other end of the oil pipe assembly 33 is fixedly connected to one end of the circular tube 58. The other end of the circular tube 58 is connected to the inside of the oil pump 12.

[0038] Specific usage of this invention: The power components in the integrated powertrain of the electric counterbalance forklift include an oil pump motor 10 and an oil pump 12. The oil pump motor 10 is directly connected to the oil pump 12 via a drive shaft, driving the oil pump 12 to operate. The impeller inside the oil pump 12 generates centrifugal force when rotating, drawing hydraulic oil from the inlet end 13 into the cooling assembly. The hydraulic oil is then transported to the oil pump 12 via the oil pipe assembly 33 and the circular pipe 58 within the cooling assembly. The oil pump 12 pressurizes the hydraulic oil and delivers it through the oil pipes to the lifting cylinder or hydraulic motor, enabling actions such as lifting, tilting, or turning of the goods. The main heat-generating components are the rotor 56 and stator 55 of the oil pump motor 10 and the impeller of the oil pump 12, thus requiring internal cooling of the oil pump motor 10 and the oil pump 12.

[0039] Simultaneously, hydraulic oil is drawn into the oil pipe assembly 33 through the oil inlet 13. The hydraulic oil flows within the oil pipe assembly 33, and the contact time between the hydraulic oil and coolant is extended by the several annular oil pipes and several connecting oil pipes in the oil pipe assembly 33, which is beneficial to improving the heat exchange effect between the hydraulic oil and coolant. The cooled hydraulic oil is then transported to the circular pipe 58, where it provides oil cooling to the interior of the rotor 56. Furthermore, the circular pipe 58 and the cooling water pipe 59 provide dual heat dissipation to both the interior and exterior of the rotor 56, greatly reducing the temperature of the rotor 56. The hydraulic oil is also transported to the oil pump 12 through the circular pipe 58, where the cooled hydraulic oil provides oil cooling to the impeller inside the oil pump 12. This allows the hydraulic oil to quickly carry away the heat from the oil pump motor 10 and the oil pump 12, extending their service life. The system utilizes coolant and hydraulic oil for cooling, and designs a dual-circulation system of water cooling and oil cooling. Heat exchange is achieved through heat exchange, avoiding direct mixing of water and oil and reducing the risk of corrosion. The water cooling circulation can use low-cost coolant (such as ethylene glycol aqueous solution), while the oil cooling circulation protects precision components (such as bearings and gears).

[0040] The coolant in the first hydraulic chamber 17 is delivered to the cooling water pipe 59, where it spirals and cools the inside of the oil pump motor 10, reducing the temperature of the stator 55 and rotor 56. The coolant in the cooling water pipe 59 is then delivered to the second hydraulic chamber 18, which in turn is delivered to the cooler 19 via the first connecting pipe 51. The cooler 19 cools the coolant, which is then delivered back to the first hydraulic chamber 17 via the second connecting pipe 52. This circulation of coolant within the first hydraulic chamber 17, cooling water pipe 59, second hydraulic chamber 18, and cooler 19 ensures continuous water cooling of the inside of the oil pump motor 10.

[0041] The coolant in the heat dissipation assembly circulates within the first hydraulic chamber 17, cooling water pipe 59, second hydraulic chamber 18, and cooler 19. During the long-term circulation process, scale tends to adhere to the inner wall of the cooling water pipe 59. The thickness of the scale layer gradually increases, which not only affects the heat exchange efficiency between the coolant and the inner wall of the oil pump motor 10, but also blocks the cooling water pipe 59, affecting the circulation of the coolant.

[0042] Meanwhile, during continuous heat exchange between the coolant in the movable frame 16 and the hydraulic oil in the oil pipe assembly 33, scale easily adheres to the outer wall of the oil pipe assembly 33. The thickness of the scale layer gradually increases, affecting the heat exchange efficiency between the coolant and the hydraulic oil in the oil pipe assembly 33. Therefore, it is necessary to treat the coolant in the heat dissipation assembly.

[0043] The control system controls the two waterproof motors 38 to start, and the waterproof motors 38 drive the circular plate 39 to rotate. The rotation of the circular plate 39 drives the movable frame 16 to move back and forth vertically within the frame 15 via the second connecting plate 40.

[0044] When the movable frame 16 moves upward, it delivers a portion of the coolant from the first hydraulic chamber 17 into the movable frame 16 via the second check valve 29, while another portion of the coolant from the first hydraulic chamber 17 is delivered into the cooling water pipe 59. Because a first S-shaped channel is formed between the two pressure plates 31 inside the movable frame 16 via several pairs of partitions 34, the contact time between the coolant and the hydraulic oil in the oil pipe assembly 33 is extended, thereby improving the heat exchange efficiency between the coolant and the hydraulic oil.

[0045] Several sets of cleaning components 35 are arranged between each pair of partitions 34, thereby forming several second S-shaped channels between each pair of partitions 34, further extending the contact time between the coolant and the hydraulic oil in the oil pipe assembly 33. Furthermore, the upward movement of the movable frame 16 causes the two pressure plates 31 to move upward. The upward movement of the two pressure plates 31 is pulled by the two first connecting plates 32, causing the two pressure plates 31 to move away from each other. This movement of the two pressure plates 31 causes several pairs of partitions 34 to move, and each pair of partitions 34 causes several sets of cleaning components 35 to move. The movement of the cleaning components 35 cleans the scale adhering to the outer wall of the annular oil pipe in the oil pipe assembly 33, thereby maintaining the heat exchange effect between the hydraulic oil in the oil pipe assembly 33 and the coolant in the movable frame 16. The movement of the two pressure plates 31 away from each other increases the amount of coolant between them, allowing a large amount of coolant to be delivered between the two pressure plates 31 in the movable frame 16, facilitating sufficient heat exchange between the coolant between the two pressure plates 31 and the hydraulic oil in the oil pipe assembly 33.

[0046] At the same time, the movable frame 16 moves upward to straighten the two elastic members 22, reducing the distance between the middle of the elastic member 22 and the housing 21, thereby affecting the elastic water bladder 23. This causes the solution inside the elastic water bladder 23 to be squeezed out through several first through holes 25, so that the diluted special descaling agent can be sprayed into the second hydraulic chamber 18 to reduce the scale in the coolant in the second hydraulic chamber 18.

[0047] When the movable frame 16 moves downward, it causes the two pressure plates 31 to move downward as well. The two pressure plates 31 are then pressed against by the two first connecting plates 32, bringing them closer together. This close proximity of the two pressure plates 31 forces the coolant inside the movable frame 16 to be delivered to the second hydraulic chamber 18 through the third check valve 30.

[0048] The movable frame 16 moves downward, compressing and deforming the two elastic elements 22, increasing the distance between the middle of the elastic elements 22 and the housing 21. The elastic water bladder 23 recovers its shape under the action of elasticity. The first one-way valve 24 delivers the special descaling agent from the housing 21 to the elastic water bladder 23, and several first through holes 25 absorb the coolant from the second hydraulic chamber 18 into the elastic water bladder 23, facilitating the dilution of the special descaling agent within the elastic water bladder 23. The coolant flows within the elastic water bladder 23 and contacts the two water wheels 27, thereby driving the rotating shaft 26 to rotate. The rotation of the rotating shaft 26 drives several stirring plates 28 to rotate, which in turn stirs and mixes the solution within the elastic water bladder 23, promoting the dilution of the special descaling agent.

[0049] Simultaneously, the movable frame 16 moves downwards, squeezing the coolant in the second hydraulic chamber 18 and conveying it through the port 44 to the first chamber 45. The coolant in the second hydraulic chamber 18 is filtered by the V-shaped filter plate 43, causing particulate impurities in the coolant to be filtered and retained within the second hydraulic chamber 18. The filtered coolant is then conveyed through the port 44 to the first chamber 45, where it settles. The coolant in the first chamber 45 then undergoes a secondary filtration process through several second through holes 48 to remove particulate impurities. The double-filtered coolant is then conveyed to the second chamber 46, and from there to the cooler 19 via the first connecting pipe 51. The cooler 19 cools the coolant, transferring heat to the external environment and lowering its temperature. The cooled coolant is then conveyed to the first hydraulic chamber 17 via the second connecting pipe 52.

[0050] During the up-and-down movement of the movable frame 16, the two first connecting plates 32 allow the two pressure plates 31 to alternately move closer and further apart, thereby enabling several pairs of partitions 34 and several sets of cleaning components 35 to move back and forth. This facilitates the continuous cleaning of scale on the outer wall of the annular oil pipe in the oil pipe assembly 33 using the cleaning components 35. Furthermore, it allows frequent flow of coolant between the two pressure plates 31 within the movable frame 16, preventing localized overheating of the coolant and promoting efficient heat exchange between the coolant and the hydraulic oil in the oil pipe assembly 33.

[0051] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A heat dissipation structure for an integrated powertrain of an electric counterbalance forklift, comprising a power assembly and a heat dissipation assembly; the power assembly includes an oil pump motor (10) and an oil pump (12), wherein the oil pump motor (10) has a spiral cooling water pipe (59) inside, characterized in that: The heat dissipation assembly includes a housing (14), inside which is a frame (15). Inside the frame (15), a movable frame (16) is vertically slidably arranged. Inside the frame (15), an oil pipe assembly (33) is fixedly arranged in the middle. The oil pipe assembly (33) consists of several annular oil pipes and several connecting oil pipes. The several annular oil pipes in the oil pipe assembly (33) are interconnected through the several connecting oil pipes in the oil pipe assembly (33). Inside the movable frame (16), two pressure plates (31) are symmetrically slidably arranged. The two pressure plates (31) The frame (15) has several pairs of partitions (34) on one side that are close to each other. Each pair of partitions (34) has several sets of cleaning parts (35) on one side that are close to each other. The frame (15) is divided into a first hydraulic chamber (17) and a second hydraulic chamber (18) by the movable frame (16). The second hydraulic chamber (18) has a box (21) on each side. The second hydraulic chamber (18) has two elastic elements (22) symmetrically arranged in the middle. The two boxes (21) are connected to the two elastic elements (22) by an elastic water bag (23).

2. The heat dissipation structure for an integrated powertrain of an electric counterbalance forklift according to claim 1, characterized in that: The oil pump (12) is installed on one side of the oil pump motor (10), and the outer casing (14) is installed on the other side of the oil pump motor (10). The two pressure plates (31) are respectively connected to the inner two side walls of the frame (15) by a first connecting plate (32). One end of the first connecting plate (32) is rotatably connected to the pressure plate (31), and the other end of the first connecting plate (32) is rotatably connected to the frame (15). The two pressure plates (31) are separated by several pairs of partitions (34) to form a first S-shaped channel. One end of the cooling water pipe (59) is connected to the first hydraulic chamber (17), and the other end of the cooling water pipe (59) is connected to the second hydraulic chamber (18).

3. A heat dissipation structure for an integrated powertrain of an electric counterbalance forklift according to claim 2, characterized in that: Each set of cleaning components (35) consists of several pairs of cleaning components (35). Several second S-shaped channels are formed between each pair of partitions (34) through several sets of cleaning components (35). Several clearance grooves (36) are provided on each partition (34) at intervals. The annular oil pipe in the oil pipe assembly (33) slides in the clearance groove (36). A rubber component (37) is provided between the outer wall of the annular oil pipe in the oil pipe assembly (33) and the clearance groove (36).

4. The heat dissipation structure for an integrated powertrain of an electric counterbalance forklift according to claim 1, characterized in that: The elastic element (22) has a V-shaped structure. One end of the elastic element (22) is fixedly connected to one side wall of the second hydraulic chamber (18), and the other end of the elastic element (22) is fixedly connected to one side wall of the movable frame (16). The middle part of the elastic element (22) is connected to the interior of the elastic water bladder (23) and is provided with several first through holes (25). The interior of the elastic water bladder (23) is connected to the interior of the box (21) and is provided with a first one-way valve (24).

5. A heat dissipation structure for an integrated powertrain of an electric counterbalance forklift according to claim 4, characterized in that: The elastic water bladder (23) is provided with a rotating shaft (26) inside. A water wheel (27) is respectively fitted on the outer wall of both ends of the rotating shaft (26). A number of stirring plates (28) are arranged in a circular array on the outer wall of the middle part of the rotating shaft (26).

6. A heat dissipation structure for an integrated powertrain of an electric counterbalance forklift according to claim 1, characterized in that: The interior of the movable frame (16) is connected to the first hydraulic chamber (17) by a second check valve (29), and the interior of the movable frame (16) is connected to the second hydraulic chamber (18) by a third check valve (30). Two waterproof motors (38) are symmetrically installed inside the first hydraulic chamber (17). The output end of the waterproof motor (38) is provided with a circular plate (39). One side of the circular plate (39) is connected to the outer wall of the movable frame (16) by a second connecting plate (40). One end of the second connecting plate (40) is rotatably connected to the circular plate (39), and the other end of the second connecting plate (40) is rotatably connected to the outer wall of the movable frame (16).

7. A heat dissipation structure for an integrated powertrain of an electric counterbalance forklift according to claim 6, characterized in that: The lower outer end of the frame (15) is provided with a shell (20). The lower inner side of the shell (20) is provided with an L-shaped partition (41), and the upper side of the L-shaped partition (41) is provided with a V-shaped partition (42). The interior of the shell (20) is separated by the L-shaped partition (41) and the V-shaped partition (42) into a first cavity (45), a second cavity (46), and a liquid inlet cavity (47). The interior of the second hydraulic cavity (18) is connected to the first cavity (45). The V-shaped partition (42) has a through-hole (44), and the lower part of the V-shaped partition (42) has several second through holes (48). The first cavity (45) is connected to the second cavity (46) through several second through holes (48). The liquid inlet cavity (47) is connected to the external coolant tank and has a connection port (49). The liquid inlet cavity (47) is connected to the first cavity (45) and has a fourth one-way valve (50). The fourth one-way valve (50) is installed at one end of the L-shaped partition (41).

8. A heat dissipation structure for an integrated powertrain of an electric counterbalance forklift according to claim 7, characterized in that: An inverted V-shaped filter plate (43) is provided on the lower middle side of the second hydraulic chamber (18). The V-shaped filter plate (43) covers the opening (44). A cooler (19) is installed on the outer side of the frame (15). The second chamber (46) is connected to the cooler (19) by a first connecting pipe (51). The cooler (19) is connected to the first hydraulic chamber (17) by a second connecting pipe (52).

9. A heat dissipation structure for an integrated powertrain of an electric counterbalance forklift according to claim 1, characterized in that: The oil pump motor (10) includes a motor housing (53), a motor shaft (54) is rotatably mounted inside the motor housing (53), a rotor (56) is mounted on the outer wall of the motor shaft (54), a stator (55) is mounted on the inner wall of the motor housing (53), a plurality of heat dissipation fins (57) are mounted on the outer wall of the motor housing (53), and a cooling water pipe (59) is located between the outer wall of the rotor (56) and the inner wall of the stator (55).

10. A heat dissipation structure for an integrated powertrain of an electric counterbalance forklift according to claim 9, characterized in that: The motor shaft (54) has a rotating cylindrical tube (58) inside. The outer casing (14) has an oil inlet (13) in the middle of one side. One end of the oil pipe assembly (33) is connected to the oil inlet (13), and the other end of the oil pipe assembly (33) is fixedly connected to one end of the cylindrical tube (58). The other end of the cylindrical tube (58) is connected to the inside of the oil pump (12).

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